// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_CAPTURE_DEVICES_IMPL_H_
#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_CAPTURE_DEVICES_IMPL_H_

#include "base/macros.h"
#include "base/memory/singleton.h"
#include "content/public/browser/media_capture_devices.h"

namespace content {

class MediaCaptureDevicesImpl : public MediaCaptureDevices {
public:
    static MediaCaptureDevicesImpl* GetInstance();

    // Overriden from MediaCaptureDevices
    const MediaStreamDevices& GetAudioCaptureDevices() override;
    const MediaStreamDevices& GetVideoCaptureDevices() override;

    // Called by MediaStreamManager to notify the change of media capture
    // devices, these 2 methods are called in IO thread.
    void OnAudioCaptureDevicesChanged(const MediaStreamDevices& devices);
    void OnVideoCaptureDevicesChanged(const MediaStreamDevices& devices);

private:
    friend struct base::DefaultSingletonTraits<MediaCaptureDevicesImpl>;
    MediaCaptureDevicesImpl();
    ~MediaCaptureDevicesImpl() override;

    void UpdateAudioDevicesOnUIThread(const content::MediaStreamDevices& devices);
    void UpdateVideoDevicesOnUIThread(const content::MediaStreamDevices& devices);

    // Flag to indicate if device enumeration has been done/doing.
    // Only accessed on UI thread.
    bool devices_enumerated_;

    // A list of cached audio capture devices.
    MediaStreamDevices audio_devices_;

    // A list of cached video capture devices.
    MediaStreamDevices video_devices_;

    DISALLOW_COPY_AND_ASSIGN(MediaCaptureDevicesImpl);
};

} // namespace content

#endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_CAPTURE_DEVICES_IMPL_H_
